module.exports = (req, res, next) => {
  if (req.method === "POST" && req.path === "/login") {
    if (req.body.username === 'jack' && req.body.password === '123456') {
      return res.status(200).json({
        user: {token: 'tttoken'}
      })
    } else {
      return res.status(400).json({
        message: '用户名或密码错误'
      })
    }
  }
  next()
}